Mya’s suggestions:
What do you pack for a Day Case?
Form of photographic ID
Pre and post-op information including relevant contact details
Hospital/Clinic address
Slippers
Dressing gown (some patients get cold or like the comfort of personal items)
Reading material, book or magazines
iPad/Mobile phone
Chargers!
Sports bra (if applicable)
Pillow (personal choice for comfort for patients traveling home)
Roller ball deodorant (after)
Hair bobble
Baby wipes
I would also add lip balm as general anaesthetic gives you really dry lips and a good face moisturiser too